Broccoli is probably the most stereotypical vegetable. I think so many people--mainly kids?--hate it without even trying it just because it's so universally known as The Vegetable Not to Be Eaten (but to Vehemently Scream About Not Eating). But once you actually try broccoli you may find that it's not so terrible and that all that fuss was for nothing and that you should listen to your elders and eat your damn vegetables (even if the dogs won't touch it).
But here's how broccoli tastes, at least in my opinion: I don't dislike it, but I don't like it, either. (Sound familiar?) If broccoli is for dinner I'll eat it, no problem, but I'm never going to be all, "Ooh, broccoli, yes, GIMME GIMME GIMME!" Broccoli doesn't taste gross, but it's no bacon or chocolate and it doesn't get my taste buds going. It's just broccoli, plain and simple. There's nothing memorable about it--except for maybe its appearance--and I'll eat it but I'll neither enjoy nor hate eating it. Again: it's just broccoli. (No offense, by the way, for those people who do love broccoli. You're probably better at eating veggies than I am.)
And so we now have The Broccoli Book. It's that book that doesn't quite have a place on the reading scale. It doesn't lean toward dislike, but it doesn't lean toward like, either. You don't feel much of anything toward it, and once you turn the last page and set it down the book never really crosses your mind. You read it and that's just about it. Now the book is just there and if someone asks you what you thought of it you don't know what to say because there's no term for it. Like broccoli. (Just don't try eating the book or feeding it to your dog.)